alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Wadolin.Downloader CnC Beacon"; flow:established,to_server; http.uri; content:"/upgrade-functions.php?v="; fast_pattern; content:"&id="; http.user_agent; content:"Mozilla/4.0 (compatible|3B| MSIE 6.1|3B| Windows XP)"; startswith; reference:md5,693c007d651bb5a8c6d2a4f5ed65a69c; classtype:command-and-control; sid:2019827; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_12_01, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_05_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)